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<p>[QUOTE=&quot;Defenderone, post: 2580784, member: 82186&quot;]Thanks but I don&#039;t think is the result of any type of acid. As I have read about the1982-83 planchets alloy were kinda bad and created all kinds of problems. quote: &quot;The copper-coated zinc planchets introduced in 1982 caused all sorts of problems&quot; page 100 Red Book Lincoln Cents, 2008 edition. and I was thinking if this might be one of those problems...but I am very curious about the letters or numbers on the bottom of the coin and how it happened.[/QUOTE]</p><p><br /></p>

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